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Employee Benefits (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
U.K. [Member]
       
Defined Benefit Plan Disclosure        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 58 52 174 156
Expected return on plan assets (82) (74) (247) (223)
Amortization of net actuarial loss 13 12 40 36
Net periodic (benefit) cost     (33) (31)
Curtailment loss (gain) and other     0 0
Total net periodic (benefit) cost (11) (10) (33) (31)
Estimate of contributions to defined benefit pension plans for the current fiscal year 183   183  
Contributions made to defined benefit pension plans 24 54 145 241
U.S. [Member]
       
Defined Benefit Plan Disclosure        
Service cost 0 0 0 0
Interest cost 32 28 96 84
Expected return on plan assets (39) (34) (117) (103)
Amortization of net actuarial loss 11 13 32 39
Net periodic (benefit) cost     11 20
Curtailment loss (gain) and other     1 0
Total net periodic (benefit) cost 4 7 12 20
Estimate of contributions to defined benefit pension plans for the current fiscal year 173   173  
Contributions made to defined benefit pension plans 39 54 112 122
Other [Member]
       
Defined Benefit Plan Disclosure        
Service cost 0 5 0 14
Interest cost 12 11 36 33
Expected return on plan assets (15) (15) (45) (44)
Amortization of net actuarial loss 2 6 6 19
Net periodic (benefit) cost     (3) 22
Curtailment loss (gain) and other     (3) 0
Total net periodic (benefit) cost (1) 7 (6) 22
Estimate of contributions to defined benefit pension plans for the current fiscal year 29   29  
Contributions made to defined benefit pension plans $ 7 $ 5 $ 23 $ 49